AmScope 40x-1000x Advanced Home School Student Widefield Biological Compound Microscope with Sturdy Metal Framework and All Optical Glass Lenses Compound microscope provides high magnification for biological use and educational applications Monocular viewing head with 10x widefield eyepiece, fixed 45-degree vertical inclination to reduce eye and neck strain, 360-degree rotation capability to enable sharing, and anti-mold head to preserve optics in high-humidity areas Forward-facing nosepiece with precision-ground 4x, 10x, 40x(S), and 100x(S,Oil)DIN achromatic glass objectives provide color correction of magnified images Brightfield imaging with rheostat-controlled tungsten (incandescent) illumination and spiral-control 1.25 NA Abbe condenser with iris diaphragm and color filter Plain stage with clips to secure specimen, separate coarse and fine focus on rack-and-pinion mechanism to provide precise focus, and tension control to prevent stage drift